.308 SPS Tact. 20" barrel 1:12 twist
rem brass
CCI 200LR primers
IMR 3031 (for now, it was available)
Sierra 168 gr HPBT
2.800 OAL in a 2.980 COAL
I worked up a load using an OCW method. The particular method I chose started loads at 10% below max working up 1% at a time until max is reached. The minimum load I started with proved the best group (pic included). The groups were fired using a "round robin" sequence, so no single target was fired twice in a row. I also fired from a vise type rest to take the as much of the human error out as possible. Velocities are not know as I dont have a crono. I started showing pressure signs(very slightly bulged case) at 40.6 gr, 41gr being sierra's recommended max. Though the case was slightly buldged it extracted just fine, if I hadnt been inspecting each case carefully I wouldn't have noticed.
Now because my lowest load was the best group I am going to load up 1 and 2% below that and 1% above to confirm that it is the most accurate load.
Best load was 39.3 gr
Thoughts? suggestions?
Target shot at 100 yards
rem brass
CCI 200LR primers
IMR 3031 (for now, it was available)
Sierra 168 gr HPBT
2.800 OAL in a 2.980 COAL
I worked up a load using an OCW method. The particular method I chose started loads at 10% below max working up 1% at a time until max is reached. The minimum load I started with proved the best group (pic included). The groups were fired using a "round robin" sequence, so no single target was fired twice in a row. I also fired from a vise type rest to take the as much of the human error out as possible. Velocities are not know as I dont have a crono. I started showing pressure signs(very slightly bulged case) at 40.6 gr, 41gr being sierra's recommended max. Though the case was slightly buldged it extracted just fine, if I hadnt been inspecting each case carefully I wouldn't have noticed.
Now because my lowest load was the best group I am going to load up 1 and 2% below that and 1% above to confirm that it is the most accurate load.
Best load was 39.3 gr
Thoughts? suggestions?
Target shot at 100 yards
